With different sprites and sound effects, Angry Birds could just have easily been called Cash Cow, because that's exactly what it is. We're not hatin', mind you; Angry Birds is hella fun and we wish developer Rovio all the success in the world. Some of that success has already come, with plush dolls and an animated series in the works, but if Rovio goes public like it wants to, the money made so far would seem like chump change.